You have to really want to learn about "product management" in the context of tech companies to get anything out of this manual, but I sort of did, and did, and my thinking did change in some helpful ways at work, and the cool part is that some of the big ideas here (the importance of product+engineering together continuously interviewing customers, especially) is also a big point from a book I read 3 years ago that really impressed me, Beyond Command and Control.
For film buffs this glimpse of Kubrick's style developing in the mid-fifties is very cool (interplay of light and shadow, action sequences, camera angles), and the story overall is tense and enveloping, altho on final consideration the plot was thin.